Therapeutic methods of treating chronic lymphocytic leukemia (CLL) and small lymphocytic leukemia (SLL) are described. In certain embodiments, the invention includes therapeutic methods of treating CLL and SLL using a BTK inhibitor. In certain embodiments, the invention includes therapeutic methods of treating subtypes of CLL and SLL using a BTK inhibitor, including subtypes of CLL in patients sensitive to thrombosis and subtypes of CLL that increase monocytes and NK cells in peripheral blood after treatment with a BTK inhibitor. In certain embodiments, the invention includes therapeutic methods of treating CLL and SLL using a combination of a BTK inhibitor and an anti-CD20 antibody.本發明說明治療慢性淋巴球性白血病(CLL)和小淋巴球性白血病(SLL)之治療方法。在某些實施態樣中,本發明包括使用BTK抑制劑治療CLL和SLL之治療方法。在某些實施態樣中,本發明包括使用BTK抑制劑治療CLL和SLL的亞型之治療方法,該等亞型包括對血栓形成敏感之病患的CLL亞型及在以BTK抑制劑治療之後增加末梢血液中的單核球和天然殺手(NK)細胞之CLL亞型。在某些實施態樣中,本發明包括使用BTK抑制劑與抗CD20抗體之組合以治療CLL和SLL之治療方法。